php实现商品类

商品类的基本结构

在PHP中实现商品类，通常需要定义商品的基本属性（如名称、价格、库存等）和方法（如获取信息、更新库存等）。以下是一个基础的实现示例：

class Product {
    private $id;
    private $name;
    private $price;
    private $stock;

    public function __construct($id, $name, $price, $stock) {
        $this->id = $id;
        $this->name = $name;
        $this->price = $price;
        $this->stock = $stock;
    }

    public function getId() {
        return $this->id;
    }

    public function getName() {
        return $this->name;
    }

    public function getPrice() {
        return $this->price;
    }

    public function getStock() {
        return $this->stock;
    }

    public function updateStock($quantity) {
        $this->stock += $quantity;
    }
}

扩展商品类的功能

可以添加更多属性和方法以满足实际需求，例如商品分类、折扣计算、描述信息等：

class Product {
    private $id;
    private $name;
    private $price;
    private $stock;
    private $category;
    private $description;
    private $discount = 0;

    public function __construct($id, $name, $price, $stock, $category, $description) {
        $this->id = $id;
        $this->name = $name;
        $this->price = $price;
        $this->stock = $stock;
        $this->category = $category;
        $this->description = $description;
    }

    public function setDiscount($discount) {
        $this->discount = $discount;
    }

    public function getFinalPrice() {
        return $this->price * (1 - $this->discount / 100);
    }

    public function getDetails() {
        return [
            'id' => $this->id,
            'name' => $this->name,
            'price' => $this->price,
            'final_price' => $this->getFinalPrice(),
            'stock' => $this->stock,
            'category' => $this->category,
            'description' => $this->description
        ];
    }
}

数据库交互

商品类通常需要与数据库交互，以下是一个简单的数据库操作示例：

class ProductRepository {
    private $db;

    public function __construct($db) {
        $this->db = $db;
    }

    public function save(Product $product) {
        $stmt = $this->db->prepare("INSERT INTO products (name, price, stock) VALUES (?, ?, ?)");
        $stmt->execute([$product->getName(), $product->getPrice(), $product->getStock()]);
    }

    public function findById($id) {
        $stmt = $this->db->prepare("SELECT * FROM products WHERE id = ?");
        $stmt->execute([$id]);
        $data = $stmt->fetch();
        return new Product($data['id'], $data['name'], $data['price'], $data['stock']);
    }
}

实际应用示例

创建一个商品对象并调用其方法：

$product = new Product(1, "Laptop", 999.99, 10, "Electronics", "High-performance laptop");
$product->setDiscount(10);
echo $product->getFinalPrice(); // 输出折扣后的价格
print_r($product->getDetails()); // 输出商品详细信息

通过以上方式，可以灵活扩展商品类的功能，满足不同的业务需求。